Dacia SuperNova (engine E7J). Service manual — part 61
30
GENERAL
30 - 7
Rigid pedal: when braking,
an increased effort for a small
deceleration is performed
Yes
Replace: shaft, pedal or
servobrake fork.
Yes
Yes
Yes
No
No
No
No
Replace the servobrake
(broken membrane)
Replace the servobrake
(broken membrane)
Check:
- the integrity of the depression
pipe, consequently of the retain-
ing valve;
- the sealing of the depression pipe
at the servobrake, consequently at
the vacuum pump (inlet manifold).
Is the engine
regime
changing when
braking ?
The engine
pedal is rigid
from time to
time ?
1
Is the connection
shaft between
the servobrake
fork and the pedal,
grabed?
At the servobrake
entrance is the
depression the
imposed one ?
I. FAILURE : RIGID PEDAL
BRAKING SYSTEM DIAGNOSTIC
30
GENERAL
30 - 8
1
I. FAILURE : RIGID PEDAL (ctd)
One of the
rigid brake
pipes is it
smashed ?
Dismount the brake caliper or
the brake cylinder?
Replace the corresponding
rigid pipe.
Are the brake
caliper’s pistons
or the cylinders
ones correctly
gliding ?
STOP
Replace the defective parts
(with Genuine Spare Parts)
Replace the brake pads,
consequently the brake shoes
(see bellow situations).
Are the brake pads,
consequently the shoes
gasket in good
condition?
The brake linings are to be replaced when
they are: -greasy
-shiny
-not in accordance with the
manufacturer’s prescriptions (genuine Spare
Parts have not been used).
Yes
Yes
No
No
No
BRAKING SYSTEM DIAGNOSTIC
30
GENERAL
30 - 9
II. FAILURE : LONG PEDAL
When braking, the brake pedal is slowly moving.
Perform a test with the stopped engine, after
previously performing five successive pushing on
the brake pedal (in order to vacuum the servobrake).
Locate and repair or replace the
item where a brake fluid leak is
established.
Yes
No
Is the brake fluid
level lower
compared to the
required one?
Replace the brake pump, because the pressure gas-
ket (sealing) between the primary circuit and the
secondary circuit is defective.
STOP
BRAKING SYSTEM DIAGNOSTIC
30
GENERAL
30 - 10
BRAKING SYSTEM DIAGNOSTIC
I. CONSTANT EFFECT TO THE PEDAL
EFFECTS
Tough pedal:
High effort for small deceleration.
Elastic pedal
In order to diagnose, an incident where
the use was normal is to be analyzed and
two tests are to be performed:
1. While driving the vehicle :
Interpretation test: pedal stroke/
deceleration rate.
2. While vehicle is stopped, engine cut.
Additional test of brake pedal press:
Perform five consecutive pressings on the
brake pedal in order to vacuum the
servobrake, before taking into
consideration the test result.
Long pedal
The test is to be performed with stopped
vehicle and cut engine.
REMARK:
I t is neces sary to perform five
consecutive pressings on the brak e
pedal, in ord er to vacuum the
servobrake before takin g into
consideration the test result.
Floor pedal
The test is to be performed with stopped
vehicle and cut engine.
REMARK :
Perform five consecutive pressings on
the brake pedal, in order to vacuum the
servobrake before takin g into
consideration the test result.
POSSIBLE CAUSES
- Assistance defect
- Brake linings:
- greasy
- stacking to the disk ( non-conform )
- heating, prolonged braking with constant
pedal press
- Stuck piston
- Rigid duct narrowed (flattening)
- Air presence in the circuit: defective
purging
- Internal leak in the braking circuit.
- Leak of fluid from reservoir (external fluid
leak from braking circuit).
Automatic adjustment : hand brake cable too
tighten.
- Important and asymmetric wear of the
brake linings
- Stroke too ample between the servobrake
pushing rod and the brake pump
- Brake fluid having high temperature.
- Hydraulic leak (check the sealing of
the braking system components)
- Sealing gaskets defects of the two
brake pump circuits.
- Brake fluid having high temperature
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